Grinding mill



(No Model.) 2 Sheets-Shet 1- R. KENT. GRINDING MILL.

N0. 406,651.- Patented July 9, 1889..

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(No M ode l.) 2 Sheets-Sheet 2. RI GRINDING MILL.

No. 406,651. Patented July 9, 1889.

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WY? m fizmfw BY ATTORNEY N. PETERS. PMO-Uthagmpkr, Wathlnglon II C.

UNITED STATES PATENT OFFICE.

ROBERT KENT, OF BROOKLYN, NEV YORK.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 406,651, dated July 9,1889.

Application filed April 29, 1887- To all whom it may concern.-

Be it known that 1, ROBERT KENT, a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, haveinvented certain new and useful Improvements in Grindingdvlills; and Ido hereby declare that the following is a full, clear, and exactdescription of the invention,

which will enable others skilled in the art burr or other stone in theusual manner, is-

attached to the hollow annular casting O, the outer circumference a ofsaid casting being preferably provided with a surrounding band or flangeD. The stone A, casting G, and band D are stationary and supported bythe usual or by any suitable means. The lower stone E is secured upon ahollow casting F, which latter is preferably arranged to run within afixed circumferential band G. From the center of the casting F, andextending upward through the center of the'stone E, is a tubular sleeveH, the upper part of which is arranged within a stufling-box I, of whichthe packing is shown at b. This sleeve H com municates with a pipe K,which is so shaped and arranged as to connect at its opposite .end withthe interior of the hollow casting O.

. the contiguous surface of the stone, in order serial No. 236,637. (Nomodel.)

stepped into a hollow socket R, which is ex-.

ternally threaded and screwed into a fixed nut T, which, like the upperbearing of the shaft M and the bearings of the driving-shaft Q, isstationary and preferably fastened upon the fixed frame-work of theapparatus. Upon the upperpart of the threaded socket B is a spur-wheelV, into which gears a spur-pinion WV upon the lower end of a verticalshaft Y, which is supported in suitable fixed bearings, and which has atits upper end a hand-wheel D, or equivalent device-such, for example, asa crank-from which the spur-pinion W may be readily turned. By turningthe shaft Y, and consequently the spur-pinion WV, spurwheel V, andthreaded socket R, the latter may be raised and lowered in other words,delicately adjusted-to raise and lower the shaft M, and consequently thelower stone, to adjust the latter in exactly the desired re lation tothe upper stone, not only to adapt the mill to the requirements of anyparticular material, but also for the wearing away of the stone bycontinued use.

Cold water or other refrigerating-fluid be ing caused "to pass inwardthrough the pipe L passes into the interior or water-space, so called,of the lower casting F, this inward cooling being through the middleportion of the sleeve H and along thelower part of the casting F. Onreaching the circumference of the latter it returns and flows along thetop of said casting, thence upward through the circumferential portionsof the sleeve H into and through -the pipe K, thence into the interioror water-space, so called, of the upper casting, and thence out throughthe outare to be-kept cool, cold water or other refrigerating-fluid isto be used, as hereinbefore set forth; but in the grinding of materialswhich require to be heated during the operation the water should beheated by any suitable means to the requisite extent; or steam or hotair or other suitable heated fluid may be used for circulating throughthe apparatus, as described, for bringing the stones to the requisitetemperature.

Referring to Fig. 1, it will be seen that the relation of the sleeve 1-1of the lower hollow casting to the supply-pipe L and to the upper hollowcasting and its supply-pipe gives the important advantage of causing thewater flowing out from the lower casting to flow past the enteringstream and around the supply-pipe L to the hollow casting of the upperstone. This outflow of the water in its cooling function upon the lowerstone, and from which it has absorbed heat, is again cooled before itenters the casting of the upper stone by having to pass and mingle withthe body of the inflow and to pass out above the stones around thesupply-pipe to perform its cooling function within the upper casting. Inthis provision for cooling the water, in passing from one stone to theother, the inflow and the outflow are in opposite directions and theirconjunction is within the same pipe. This advantage cannot be obtainedin a construction wherein the water has a direct flow from thecooling-chamber of the upper stone to the cooling-chamber of the lowerstone, the inflow and the outflow being in the same direction.

What I claim as my invention is c In a grinding-mill, the combination ofthe upper and the lower stones and their hollow metal chambers withmeans for producing a circulation of water within said chambers,consisting of the sleeve H, extending from the lower chamber up throughthe eye of and above the upper stone and its cooling-chamher, the pipeK, having a stuffing-box I, connecting it with the upper end of saidsleeve, and having also a lateral branch communicating with thecooling-chamber of the upper stone, and the supply-pipe L, passing intothe top of said pipe K and terminating below the communication of thelatter with its side branch, whereby the cold water entering thesupply-pipe and the lower cooling-chamber is caused to return and passfrom the latter by the inflow and around the supply-pipe to the 'uppercooling-chamber, substantially as described.

ROBERT KENT. \Vitnesses:

JAMES W. KENT, JAMES ROBERTSON.

